Function mraa_sys::mraa_spi_init_raw

pub unsafe extern "C" fn mraa_spi_init_raw(
    bus: c_uint, 
    cs: c_uint
) -> mraa_spi_context

Initialise SPI_context without any board configuration, selects a bus and a mux.

@param bus Bus to use as listed by spidev @param cs Chip select to use as listed in spidev @return Spi context or NULL